1
                                                                EXHIBIT 10.5.b

                35--Lease, Business Premises.           JULIUS BLUMBERG, INC.
                    Loft, Office or Store.              LAW BLANK PUBLISHERS

                THIS LEASE made the          day of January 1988, between MARCUS
                REALTY, with offices at 684 Broadway, Massapequa, New York 11758
                hereinafter referred to as LANDLORD, and MANCHESTER EQUIPMENT
                CO., INC., a domestic corporation with offices at 50 Marcus
                Blvd., Hauppauge, New York 11788 hereinafter jointly, severally
                and collectively referred to as TENANT.

                WITNESSETH, that the Landlord hereby leases to the Tenant, and
                the Tenant hereby hires and takes from the Landlord the building
                and parcel of land located at 50 Marcus Blvd., Hauppauge, New
                York, as more particularly shown on the survey annexed hereto
                and made a part hereof to be used and occupied by the Tenant for
                any and all purposes permitted by the zoning laws and other
                ordinances, rules and regulations of the municipalities having
                jurisdiction thereover and for no other purpose, for a term of
                ten (10) years to commence on February 1, 1988, and to end on
                January 31, 1998, unless sooner terminated as hereinafter
                provided, at the total rental of $3,810,000.00, as per Paragraph
                36th of Rider, payable as follows: 2/1/88 - 1/31/89 - $300,000.
                ($25,000. per mo.); 2/1/89 - 1/31/90 - $318,000. ($26,500. per
                mo.); 2/1/90 - 1/31/91 - $336,000. ($28,000. per mo.); 2/1/91 -
                1/31/92 - $354,000. ($29,500. per mo.); 2/1/92 - 1/31/93 -
                $372,000. ($31,000. per mo.); 2/1/93 - 1/31/94 - $390,000.
                ($32,500. per mo.); 2/1/94 - 1/31/95 - $408,000. ($34,000. per
                mo.); 2/1/95 - 1/31/96 - $426,000. ($35,500. per mo.); 2/1/96 -
                1/31/97 - $444,000. ($37,000. per mo.); 2/1/97 - 1/31/98 -
                $462,000. ($38,500. per mo.). 

                        THE TENANT JOINTLY AND SEVERALLY COVENANTS:

                        FIRST.--That the Tenant will pay the rent as above 
                provided.

REPAIRS                 SECOND.--That, throughout said term the Tenant will take
                good care of the demised premises, fixtures and appurtenances,
                and all alterations, additions and improvements to either; make
                all repairs in and about the same necessary to preserve them in
                good order and condition, which repairs shall be, in quality and
                class, equal to the original work; promptly pay the expense of
ORDINANCES      such repairs; suffer no waste or injury; give prompt notice to
   AND          the Landlord of any fire that may occur; execute and comply with
VIOLATIONS      all laws, rules, orders, ordinances and regulations at any time
                issued or in force (except those requiring structural
                alterations), applicable to the demised premises or to the
                Tenant's occupation thereof, of the Federal, State and Local
                Governments, and of each and every department, bureau and
ENTRY           official thereof, and of the New York Board of Fire
                Underwriters; permit at all times during usual business hours,
                the Landlord and representatives of the Landlord to enter the
                demised premises for the purpose of inspection, and to exhibit
                them for purposes of sale or rental; suffer the Landlord to make
                repairs and improvements to all parts of the building, and to
                comply with all orders and requirements of governmental
                authority applicable to said building or to any occupation
                thereof; suffer the Landlord to erect, use, maintain, repair and
                replace pipes and conduits in the demised premises and to the
INDEMNIFY       floors above and below; forever indemnify and save harmless the
LANDLORD        Landlord for and against any and all liability, penalties,
                damages, expenses and judgments arising from injury during said
                term to person or property of any nature, occasioned wholly or
                in part by any act or acts, omission or omissions of the Tenant,
                or of the employees, guests, agents, assigns or undertenants of
                the Tenant and also for any matter or thing growing out of the
                occupation of the demised premises or of the streets, sidewalks
                or vaults adjacent thereto; permit, during the six months next
                prior to the expiration of the term the usual notice "To Let" to
                be placed and to remain unmolested in a conspicuous place upon
                the exterior of the demised premises; repair, at or before the
                end of the term, all injury done by the installation or removal
                of furniture and property; and at the end of the term, to quit
                and surrender the demised premises with all alterations,
                additions and improvements in good order and condition.

                        THIRD.--That the Tenant will not disfigure or deface any
MOVING          part of the building, or suffer the same to be done, except so
INJURY          far as may be necessary to affix such trade fixtures as are
SURRENDER       herein consented to by the Landlord; the Tenant will not
                obstruct, or permit the obstruction of the street or the
                sidewalk adjacent thereto; will not do anything, or suffer
                anything to be done upon the demised premises which will
                increase the rate of fire insurance upon the building or any of
                its contents, or be liable to cause structural injury to said
                building; will not permit the accumulation of waste or refuse
NEGATIVE        matter, and will not, without the written consent of the 
COVENANTS       Landlord first obtained in each case, either sell, assign, 
                mortgage or transfer this lease, underlet the demised premises
                or any part thereof, permit the same or any part thereof to be
                occupied by anybody other than the Tenant and the Tenant's
                employees, make any alterations in the demised premises, use the
                demised premises or any part thereof for any purpose other than
                the one first above stipulated, or for any purpose deemed extra
                hazardous on account of fire risk, nor in violation of any law
CONSTRUCTION    or ordinance. That the Tenant will not obstruct or permit the
SIGNS           obstruction of the light, halls, stairway or entrances to the
                building, and will not erect or inscribe any sign, signals or
                advertisements unless and until the style and location thereof
                have been approved by the Landlord; and if any be erected or
                inscribed without such approval, the Landlord may remove the
AIR             same. No water cooler, air conditioning unit or system or other
CONDITIONING    apparatus shall be installed or used without the prior written
                consent of Landlord.

                        IT IS MUTUALLY COVENANTED AND AGREED, THAT

                        FOURTH.--If the demised premises shall be partially
                damaged by fire or other cause without the fault or neglect of
                Tenant, Tenant's servants, employees, agents, visitors or
                licensees, the damages shall be repaired by and at the expense
                of Landlord and the rent until such repairs shall be made shall
                be apportioned according to the part of the demised premises
                which is usable by Tenant. But if such partial damage is due to
                the fault or neglect of Tenant, Tenant's servants, employees,
                agents, visitors or licensees, without prejudice to any other
FIRE CLAUSE     rights and remedies of Landlord and without prejudice to the
                rights of abrogation of Landlord's insurer, the damages shall
                be repaired by Landlord but there shall be no apportionment or
                abatement of rent. No penalty shall accrue for reasonable delay
                which may arise by reason of adjustment of insurance on the part
                of Landlord and/or Tenant, and for reasonable delay on account
                of "labor troubles", or any other cause beyond Landlord's
                control. If the demised premises are totally damaged or are
                rendered wholly untenantable by fire or other cause, and if
                Landlord shall decide not to restore or not to rebuild the same,
                or if the building shall be so damaged that Landlord shall
                decide to demolish it or to rebuild it, then or in any of such
                events Landlord may, within ninety (90) days after such fire or
                other cause, give tenant a notice in writing of such decision,
                which notice shall be given as in Paragraph Twelve hereof
                provided, and thereupon the term of this lease shall expire by
                lapse of time upon the third day after such notice is given, and
                Tenant shall vacate the demised premises and surrender the same
                to Landlord. If Tenant shall not be in default under this lease
                then, upon the termination of this lease under the conditions
                provided for in the sentence immediately preceding, Tenant's
                liability for rent shall cease as of the day following the
                casualty. Tenant hereby expressly waives the provisions of
                Section 227 of the Real Property Law and agrees that the
                foregoing provisions of this Article shall govern and control in
                lieu thereof. If the damage or destruction be due to the fault
                or neglect of Tenant the debris shall be removed by, and at the
                expense of, Tenant. 


                        FIFTH.--If the whole or any part of the premises hereby
                demised shall be taken or condemned by any competent authority
EMINENT         for any public use or purpose then the term hereby granted shall
DOMAIN          cease from the time when possession of the part so taken shall
                be required for such public purpose and without apportionment
                of award, the Tenant hereby assigning to the Landlord all right
                and claim to any such award, the current rent, however, in such
                case to be apportioned.

                        SIXTH.--If, before the commencement of the term, the
                Tenant be adjudicated a bankrupt, or make a "general
LEASE NOT       assignment," or take the benefit of any insolvent act, or if a
IN EFFECT       Receiver or Trustee be appointed for the Tenant's property, or
                if this lease or the estate of the Tenant hereunder be
                transferred or pass to or devolve upon any other person or
                corporation, or if the Tenant shall default in the performance
                of any agreement by the Tenant contained in any other lease to
                the Tenant by the Landlord or by any corporation of which an
                officer of the Landlord is a Director, this lease shall thereby,
                at the option of the Landlord, be terminated and in that case,
                neither the Tenant nor anybody claiming under the Tenant shall
                be entitled to go into possession of the demised premises, if
                after the commencement of the term, any of the events mentioned
                above in this subdivision shall occur, or if Tenant shall make
DEFAULTS        default in fulfilling any of the covenants of this lease, other
                than the covenants for the payment of rent or "additional rent"
                or if the demised premises become vacant or deserted, the
                Landlord may give to the Tenant ten days' notice of intention to
                end the term of this lease, and thereupon at the expiration of
                said ten days' (if said condition which was the basis of said
                notice shall continue to exist) the term under this lease shall
                expire as fully and completely as if that day were the date
                herein definitely fixed for the expiration of the term and the
                Tenant will then quit and surrender the demised premises to the
TEN DAY         Landlord, but the Tenant shall remain liable as hereinafter
NOTICE          provided. 

   2
POSSESSION     If the Tenant shall make default in the payment of the rent
LANDLORD       reserved hereunder, or any item of "additional rent" herein
               mentioned, or any part of either or in making any other payment
               herein provided for, or if the entire last above provided for
               shall have been given and if the condition which was the basis of
               said notice shall exist at the expiration of said ten days'
               period, the Landlord may immediately, or at any time thereafter,
               re-enter the demised premises and remove all persons and all or
               any otherwise, without being liable to indictment, prosecution or
               damages therefor, and re-possess and enjoy said premises together
               with all additions, alterations and improvements. In any such
               case or in the event that this lease be "terminated" before the
               commencement of the term, as above provided, the Landlord may
RE-LETTING     either re-let the demised premises or any part or parts thereof
               for the Landlord's own account, or may, at the Landlord's option,
               re-let the demised premises or any part or parts thereof as the
               agent of the Tenant, and receive the rents therefor, applying the
               same first to the payment of such expenses as the Landlord may
               leave incurred, and then to the fulfillment of the covenants of
               the Tenant herein, and the balance, if any, at the expiration of
               the term first above provided for, shall be paid to the Tenant.
               Landlord may rent the premises for a term extending beyond the
               term hereby granted without releasing Tenant from any liability.
               In the event that the term of this lease shall expire as above in
WAIVER         this sub-division "Sixth" provided, or terminate by summary
BY TENANT      proceedings or otherwise, and if the Landlord shall not re-let
               the demised premises for the Landlord's own account, then,
               whether or not the premises be re-let, the Tenant shall remain
               liable for, and the Tenant hereby agrees to pay to the Landlord,
               until the time when this lease would have expired but for such
               termination or expiration, the equivalent of the amount of all of
               the rent and "additional rent" reserved herein, less the avails
               of reletting, if any, and the same shall be due and payable by
               the Tenant to the Landlord on the several rent days above
               specified, that is, upon each of such rent days the Tenant shall
               pay to the Landlord the amount of deficiency then existing. The
               Tenant hereby expressly waives any and all right of redemption in
               case the Tenant shall be dispossessed by judgment or warrant of
               any court or judge, and the Tenant waives and will waive all
               right to trial by jury in any summary proceedings hereafter
               instituted by the Landlord against the Tenant in respect to the
               demised premises. The words "re-enter" and "re-entry" as used in
               this lease are not restricted to their technical legal meaning.

REMEDIES ARE           In the event of a breach or threatened breach by the
ACCUMULATIVE   Tenant of any of the covenants or provisions hereof, the Landlord
               shall have the right of injunction and the right to invoke any
               remedy allowed at law or in equity, as if re-entry, summary
               proceedings and other remedies were not herein provided for.

                        SEVENTH. -- If the Tenant shall make default in the
               performance of any covenant herein contained, the Landlord may
               immediately, or at any time thereafter, without notice, perform
               the same for the account of the Tenant. If a notice of mechanic's
               lien be filed against the demised premises or against premises of
LANDLORD       which the demised premises are part, for, or purporting to be
MAY            for, labor or material alleged to have been furnished, or to be
PERFORM        furnished to or for the Tenant at the demised premises, and if
               the Tenant shall fail to take such action as shall cause such
               lien to be discharged within fifteen days after the filing of
               such notice, the Landlord may pay the amount of such lien or
               discharge the same by deposit or by bonding proceedings, and in
               the event of such deposit or bonding proceedings, the Landlord
               may require the lienor to prosecute an appropriate action to
ADDITIONAL     enforce the lienor's claim. In such case, the Landlord may pay
RENT           any judgment recovered on such claim. Any amount paid or expense
               incurred by the Landlord as in this subdivision of this lease
               provided, and any amount as to which the Tenant shall at any time
               be in default for or in respect to the use of water, electric
               current or sprinkler supervisory service, and any expense
               incurred or sum of money paid by the Landlord by reason of the
               failure of the Tenant to comply with any provision hereof, or in
               defending any such action, shall be deemed to be "additional
               rent" for the demised premises, and shall be due and payable by
               the Tenant to the Landlord on the first day of the next following
               month, or, at the option of the Landlord, on the first day of any
               succeeding month. The receipt by the Landlord of any instalment
               of the regular stipulated rent hereunder or any of said
               "additional rent" shall not be a waiver of any other "additional
               rent" then due.

                        EIGHTH. -- The failure of the Landlord to insist, in any
               one or more instances upon a strict performance of any of the
               covenants of this lease, or to exercise any option herein
AS TO          contained, shall not be construed as a waiver or a relinquishment
WAIVERS        for the future of such covenant or option, but the same shall
               continue and remain in full force and effect. The receipt by the
               Landlord of rent, with knowledge of the breach of any covenant
               hereof, shall not be deemed a waiver of such breach and no
               waiver by the Landlord of any provision hereof shall be deemed to
               have been made unless expressed in writing and signed by the
               Landlord. Even though the Landlord shall consent to an assignment
               hereof no further assignment shall be made without express
               consent in writing by the Landlord.

                        NINTH. -- If this lease be assigned, or if the demised
COLLECTION     premises or any part thereof be underlet or occupied by anybody
OF RENT        other than the Tenant the Landlord may collect rent from the
FROM OTHERS    assignee, under-tenant or occupant, and apply the net amount
               collected to the rent herein reserved, and no such collection
               shall be deemed a waiver of the covenant herein against
               assignment and underletting, or the acceptance of the assignee,
               under-tenant or occupant as tenant, or a release of the Tenant
               from the further performance by the Tenant of the covenants
               herein contained on the part of the Tenant.

                        TENTH. -- This lease shall be subject and subordinate at
MORTGAGES      all times, to the lien of the mortgages now on the demised
               premises, and to all advances made or hereafter to be made upon
               the security thereof, and subject and subordinate to the lien of
               any mortgage or mortgages which at any time may be made a lien
               upon the premises. The Tenant will execute and deliver such
               further instrument or instruments subordinating this lease to the
               lien of any such mortgage or mortgages as shall be desired by any
               mortgagee or proposed mortgagee. The Tenant hereby appoints the
               Landlord the attorney-in-fact of the Tenant, irrevocable, to
               execute and deliver any such instrument or instruments for the
               Tenant.

                        ELEVENTH. -- All improvements made by the Tenant to or
IMPROVEMENTS   upon the demised premises, except said trade fixtures, shall when
               made, at once be deemed to be attached to the freehold, and
               become the property of the Landlord, and at the end or other
               expiration of the term, shall be surrendered to the Landlord in
               as good order and condition as they were when installed,
               reasonable wear and damages by the elements excepted.

                        TWELFTH. -- Any notice or demand when under the terms of
NOTICES        this lease or under any statute must or may be given or made by
               the parties hereto shall be in writing and shall be given or made
               by mailing the same by certified or registered mail addressed to
               the respective parties at the addresses set forth in this lease.

                        THIRTEENTH. -- The Landlord shall not be liable for any
LIABILITY      failure of water supply or electrical current, sprinkler damage,
               or failure of sprinkler service, nor for injury or damage to
               person or property caused by the elements or by other tenants or
               persons in said building, or resulting from steam, gas,
               electricity, water, rain or snow, which may leak or flow from any
               part of said buildings, or from the pipes, appliances or plumbing
               works of the same, or from the street or sub-surface, or from
               any other place, nor for interference with light or other
               incorporeal hereditaments by anybody other than the Landlord, or
               caused by operations by or for a governmental authority in
               construction of any public or quasi-public work, neither shall
               the Landlord be liable for any latent defect in the building.

                          
                        FOURTEENTH. -- No diminution or abatement of rent, or
NO             other compensation shall be claimed or allowed for inconvenience
ABATEMENT      or discomfort arising from the making of repairs or improvements
               to the building or to its appliances, nor for any space taken to
               comply with any law, ordinance or order of a governmental
               authority. In respect to the various "services," if any, herein
               expressly or impliedly agreed to be furnished by the Landlord to
               the Tenant, it is agreed that there shall be no diminution or
               abatement of the rent, or any other compensation, for
               interruption or curtailment of such "service" when such
               interruption or curtailment shall be due to accident, alterations
               or repairs desirable or necessary to be made or to inability or
               difficulty in securing supplies or labor for the maintenance of
               such "service" or to some other cause, not gross negligence on
               the part of the Landlord. No such interruption or curtailment of
               any such "service" shall be deemed a constructive eviction. The
               Landlord shall not be required to furnish, and the Tenant shall
               not be entitled to receive, any of such "services" during any
               period wherein the Tenant shall be in default in respect to the
               payment of rent. Neither shall there be any abatement or
               diminution of rent because of making of repairs, improvements or
               decorations to the demised premises after the date above fixed
               for the commencement of the term, it being understood that rent
               shall, in any event, commence to run at such date so above fixed.

                        FIFTEENTH. -- The Landlord may prescribe and regulate
RULES, ETC.    the placing of safes, machinery, quantities of merchandise and
               other things. The Landlord may also prescribe and regulate which
               elevator and entrances shall be used by the Tenant's employees,
               and for the Tenant's shipping. The Landlord may make such other
               and further rules and regulations as in the Landlord's judgment,
               may from time to time be needful for the safety, care or
               cleanliness of the building, and for the preservation of good
               order therein. The Tenant and the employees and agents of the
               Tenant will observe and conform to all such rules and
               regulations.

                        SIXTEENTH. -- In the event that an excavation shall be
RESTORING OF   made for building or other purposes upon land adjacent to the
WALLS          demised premises or shall be contemplated to be made, the Tenant
               shall afford to the person or persons causing or to cause such
               excavation, license to enter upon the demised premises for the
               purpose of doing such work as said person or persons shall deem
               to be necessary to preserve the wall or walls, structure or
               structures upon the demised premises from injury and to support
               the same by proper foundations.

                        SEVENTEENTH. -- No vaults or space not within the
VAULT SPACE    property line of the building are leased hereunder. Landlord
               makes no representation as to the location of the property line
               of the building. Such vaults or space as Tenant may be permitted
               to use or occupy are to be used or occupied under a revocable
               license and if such license be revoked by the Landlord as to the
               use of part or all of the vaults or space Landlord shall not be
               subject to any liability; Tenant shall not be entitled to any
               compensation or reduction in rent nor shall this be deemed
               constructive or actual eviction. Any tax, fee or charge of
               municipal or other authorities for such vaults or space shall be
               paid by the Tenant for the period of the Tenant's use or
               occupancy thereof.

                        EIGHTEENTH. -- That during seven months prior to the
ENTRY          expiration of the term hereby granted, applicants shall be
               admitted at all reasonable hours of the day to view the premises
               until rented; and the Landlord and the Landlord's agents shall be
               permitted at any time during the term to visit and examine them
               at any reasonable hour of the day, and workmen may enter at any
               time, when authorized by the Landlord or the Landlord's agents,
               to make or facilitate repairs in any part of the building: and if
               the said Tenant shall not be personally present to open and
               permit an entry into said premises, at any time, when for any
               reason an entry therein shall be necessary or permissible
               hereunder, the Landlord or the Landlord's agents may forcibly
               enter the same without rendering the Landlord or such agents
               liable to any claim or cause of action for damages by reason
               thereof (if during such entry the Landlord shall accord
               reasonable care to the Tenant's property) and without in any
               manner affecting the obligations and covenants of this lease; it
               is, however, expressly understood that the right and authority
               hereby reserved, does not impose, nor does the Landlord assume,
               by reason thereof, any responsibility or liability whatsoever for
               the care or supervision of said premises, or any of the pipes,
               fixtures, appliances or appurtenances therein contained or
               therewith in any manner connected.

                        NINETEENTH. -- The Landlord has made no representations
NO REPRE-      or promises in respect to said building or to the demised
SENTATIONS     premises except those contained herein, and those, if any
               contained in some written communication to the Tenant, signed by
               the Landlord. This instrument may not be changed, modified,
               discharged or terminated orally.

                        TWENTIETH. -- If the Tenant shall at any time be in
ATORNEY'S      default hereunder, and if the Landlord shall institute an action
FEES           or summary proceeding against the Tenant based upon such default,
               then the Tenant will reimburse the Landlord for the expenses of
               attorneys' fees and disbursements thereby incurred by the
               Landlord, so far as the same are reasonable in amount. Also so
               long as the Tenant shall be a tenant hereunder the amount of such
               expenses shall be deemed to be "additional rent" hereunder and
               shall be due from the Tenant to the Landlord on the first day of
               the month following the incurring of such respective expenses.

                        TWENTY-FIRST. -- Landlord shall not be liable for
POSSESSION     failure to give possession of the premises up on commencement
               date by reason of the fact that premises are not ready for
               occupancy, or due to a prior Tenant wrongfully holding over or
               any other person wrongfully in possession or for any other
               reason in such event the rent shall not commence until
               possession is given or is available, but the term herein shall
               not be extended.


 
   3
                THE TENANT FURTHER COVENANTS:

IF A FIRST              TWENTY-SECOND.--If the demised premises or any part
     FLOOR      thereof consist of a store, or of a first floor, or of any part
                thereof, the Tenant will keep the sidewalk and curb in front
                thereof clean at all times and free from snow and ice, and will
                keep insured in favor of the Landlord, all plate glass therein
                and furnish the Landlord with policies of insurance covering
                the same.

                        TWENTY-THIRD.--If by reason of the conduct upon the
INCREASED       demised premises of a business not herein permitted, or if by
     FIRE       reason of the improper or careless conduct of any business upon
INSURANCE       or use of the demised premises, the fire insurance rate shall at
     RATE       any time be higher than it otherwise would be, then the Tenant
                will reimburse the Landlord, as additional rent hereunder, for
                that part of all fire insurance premiums hereafter paid out by
                the Landlord which shall have been charged because of the
                conduct of such business not so permitted, or because of the
                improper or careless conduct of any business upon or use of the
                demised premises, and will make such reimbursement upon the
                first day of the month following such outlay by the Landlord;
                but this covenant shall not apply to a premium for any period
                beyond the expiration date of this lease, first above specified.
                In any action or proceeding wherein the Landlord and Tenant are
                parties, a schedule or "make up" of rate for the building on the
                demised premises, purporting to have been issued by New York
                Fire Insurance Exchange, or other body making fire insurance
                rates for the demised premises, shall be prima facie evidence of
                the facts therein stated and of the several items and charges
                included in the fire insurance rate then applicable to the
                demised premises.

                        TWENTY-FOURTH.--If a separate water meter be installed
WATER RENT      for the demised premises, or any part thereof, the Tenant will 
                keep the same in repair and pay the charges made by the
                municipality or water supply company for or in respect to the
                consumption of water, as and when bills therefor are rendered.
                If the demised premises, or any part thereof, be supplied with
                water through a meter which supplies other premises, the Tenant
                will pay to the Landlord, as and when bills are rendered
                therefor, the Tenant's proportionate part of all charges which
                the municipality or water supply company shall make for all
                water consumed through said meter, as indicated by said meter.
                Such proportionate part shall be fixed by apportioning the
                respective charge according to floor area against all of the
                rentable floor area in the building (exclusive of the basement)
                which shall have been occupied during the period of the
                respective charges, taking into account the period that each
                part of such area was occupied. Tenant agrees to pay as
                additional rent the Tenant's proportionate part, determined as
  SEWER         aforesaid, of the sewer rent or charge imposed or assessed upon
                the building of which the premises are a part.

                        TWENTY-FIFTH.--That the Tenant will purchase from the
ELECTRIC        Landlord, if the Landlord shall so desire, all electric current
 CURRENT        that the Tenant requires at the demised premises, and will pay
                the Landlord for the same, as the amount of consumption shall
                be indicated by the meter furnished therefor. The price for said
                current shall be the same as that charged for consumption
                similar to that of the Tenant by the company supplying
                electricity in the same community. Payments shall be due as and
                when bills shall be rendered. The Tenant shall comply with like
                rules, regulations and contract provisions as those prescribed
                by said company for a consumption similar to that of the Tenant.

                        TWENTY-SIXTH.--If there now is or shall be installed in
SPRINKLER       said building a "sprinkler system" the Tenant agrees to keep 
   SYSTEM       the appliances thereto in the demised premises in repair and
                good working condition, and if the New York Board of Fire
                Underwriters or the New York Fire Insurance Exchange or any
                bureau, department or official of the State or local government
                requires or recommends that any changes, modifications,
                alterations or additional sprinkler heads or other equipment be
                made or supplied by reason of the Tenant's business, or the
                location of partitions, trade fixtures, or other contents of the
                demised premises, or if such changes, modifications,
                alterations, additional sprinkler heads or other equipment in
                the demised premises are necessary to prevent the imposition of
                a penalty or charge against the full allowance for a sprinkler
                system in the fire insurance rate as fixed by said Exchange, or
                by any Fire Insurance Company, the Tenant will at the Tenant's
                own expense, promptly make and supply such changes,
                modifications, alterations, additional sprinkler heads or other
                equipment. As additional rent hereunder the Tenant will pay to
                the Landlord, annually in advance, throughout the term
                $____________ toward the contract price for sprinkler
                supervisory service.

                        TWENTY-SEVENTH. --The sum of ____NONE_______
  SECURITY      Dollars is deposited by the Tenant herein with the Landlord
                herein as security for the faithful performance of all the
                covenants and  conditions of the lease by the said Tenant. If
                the Tenant faithfully performs all the covenants and conditions
                on his part to be performed, then the sum deposited shall be
                returned to said Tenant.

                        TWENTY-EIGHTH.--This lease is granted and accepted on
  NUISANCE      the especially understood and agreed condition that the Tenant
                will conduct his business in such a manner, both as regards
                noise and kindred nuisances, as will in no wise interfere with,
                annoy, or disturb any other tenants, in the conduct of their
                several businesses, or the landlord in the management of the
                building; under penalty of forfeiture of this lease and
                consequential damages.

                        TWENTY-NINTH.--The Landlord hereby recognizes 
    BROKERS              as the broker who negotiated and consummated this lease
COMMISSIONS     with the Tenant herein, and agrees that if, as, and when the 
                Tenant exercises the option, if any, contained herein to renew
                this lease, or fails to exercise the option, if any, contained
                therein to cancel this lease, the Landlord will pay to said
                broker a further commission in accordance with the rules and
                commission rates of the Real Estate Board in the community. A
                sale, transfer, or other disposition of the Landlord's interest
                in said lease shall not operate to defeat the Landlord's
                obligation to pay the said commission to the said broker. The
                Tenant herein hereby represents to the Landlord that the said
                broker is the sole and only broker who negotiated and
                consummated this lease with the Tenant.

                        THIRTIETH.--The Tenant agrees that it will not
   WINDOW       require, permit, suffer, nor allow the cleaning of any window,
 CLEANING       or windows, in the demised premises from the outside (within the
                meaning of Section 202 of the Labor Law) unless the equipment
                and safety devices required by law, ordinance, regulation or
                rule, including, without limitation, Section 202 of the New York
                Labor Law, are provided and used, and unless the rules, or any
                supplemental rules of the Industrial Board of the State  of New
                York are fully complied with; and the Tenant hereby agrees to
                indemnify the Landlord, Owner, Agent, Manager and/or
                Superintendent, as a result of the Tenant's requiring,
                permitting, suffering, or allowing any window, or windows in the
                demised premises to be cleaned from the outside in violation of
                the requirements of the aforesaid laws, ordinances, regulations
                and/or rules.

                        THIRTY-FIRST.--The invalidity or unenforceability of
  VALIDITY      any provision of this lease shall in no way affect the validity
                or enforceability of any other provision hereof.

                        THIRTY-SECOND.--In order to avoid delay, this lease
  EXECUTION     has been prepared and submitted to the Tenant for signature with
 & DELIVERY     the understanding that it shall not bind the Landlord unless and
   OF LEASE     until it is executed and delivered by the Landlord.

                        THIRTY-THIRD.--The Tenant will keep clean and polished
EXTERIOR OF     all metal, trim, marble and stonework which are a part of the
   PREMISES     exterior of the premises, using such materials and method as the
                Landlord may direct, and if the Tenant shall fail to comply with
                the provisions of this paragraph, the Landlord may cause such
                work to be done at the expense of the Tenant.

                        THIRTY-FOURTH.--The Landlord shall replace at the
PLATE GLASS     expense of the Tenant any and all broken glass in the skylights,
                doors and walls in and about the demised premises. The Landlord
                may insure and keep insured all plate glass in the skylights,
                doors and walls in the demised premises, for and in the name of
                the Landlord and bills for the premiums therefor shall be
                rendered by the Landlord to the Tenant at such times as the
                Landlord may elect, and shall be due from and payable by the
                Tenant when rendered, and the amount thereof shall be deemed to
                be, and shall be paid as, additional rent.

                        THIRTY-FIFTH. -- This lease and the obligation of Tenant
       WAR      to pay rent hereunder and perform all of the other covenants and
 EMERGENCY      agreements hereunder on part of Tenant to be performed shall in
                nowise be affected, impaired or excused because Landlord is
                unable to supply or is delayed in supplying any service
                expressly or impliedly to be supplied or is unable to make, or
                is delayed in making any repairs, additions, alterations or
                decorations or is unable to supply or is delayed in supplying
                any equipment or fixtures if Landlord is prevented or delayed
                from so doing by reason of governmental preemption in
                connection, with a National Emergency declared by the President
                of the United States or in connection with any rule, order or
                regulation of any department or subdivision thereof of any
                government agency or by reason of the conditions of supply and
                demand which have been or are affected by war or other
                emergency.

                THE LANDLORD COVENANTS

      QUIET             FIRST.--That if and so long as the Tenant pays the
 POSSESSION     rent and "additional rent" reserved hereby, and performs and
                observes the covenants and provisions hereof, the Tenant shall
                quietly enjoy the demised premises, subject, however, to the
                terms of this lease, and to the mortgages above mentioned,
                provided however, that this covenant shall be conditioned upon
                the retention of title to the premises by Landlord.

   ELEVATOR             
                
       HEAT     



                        And it is mutually understood and agreed that the
                covenants and agreements contained in the within lease shall be
                binding upon the parties hereto and upon their respective
                successors, heirs, executors and administrators. 

                        IN WITNESS WHEREOF, the Landlord and Tenant have
                respectively signed and sealed these presents the day and year
                first above written. 


                                        MARCUS REALTY

                                        By: /s/ BARRY STEINBERG        [L.S.]
                                            -------------------------Landlord

                IN PRESENCE OF:
                                        MANCHESTER EQUIPMENT CO., INC.

                                        By: /s/ BARRY STEINBERG        [L.S.]
                                            --------------------------Tenant
                                            BARRY STEINBERG - PRES.
   4
                           RIDER TO AND FORMING PART OF LEASE
                           DATED JANUARY     , 1988, by and
                           between MARCUS REALTY, as Landlord,
                           and MANCHESTER EQUIPMENT CO., INC.,
                           as Tenant.

                  RE: Premises - 50 Marcus Blvd. Hauppauge, NY

36th. RENTAL: That the Tenant shall pay the sum of THREE MILLION EIGHT HUNDRED
TEN THOUSAND ($3,810,000.00) DOLLARS as the rental for the ten (10) year term of
the within Lease, which said total rental shall be payable at the monthly rate
as set forth on page 1 of the within Lease.

37th. INVOLUNTARY ASSIGNMENT: Notwithstanding any provision herein contained to
the contrary, the Landlord shall not be required to consent to any involuntary
assignment of this Lease or of the interest of the Tenant in this Lease by
operation of law. Each of the following acts shall be considered an involuntary
assignment:

         (a) If Tenant is or becomes bankrupt or insolvent or is a
debtor-in-possession under any insolvency statute such as "Chapter XI"
proceedings under the Bankruptcy Act, or where Tenant makes an assignment for
the benefit of creditors or institutes a proceeding under the Bankruptcy Act in
which the Tenant is a bankrupt or a debtor or a debtor-in-possession or if any
proceeding is instituted against the Tenant under the Bankruptcy Act; or if
Tenant is a partnership or consists of more than one person or entity, if any
partner of the partnership or other person or entity is or becomes bankrupt or
insolvent or makes an assignment for the benefit of creditors or in the event
any court, court officer, referee, judge, trustee or judicial officer attempts
to assign or offer for sale at auction or otherwise the subject lease; or

         (b) If a writ of attachment or execution is levied on this Lease; or

         (c) If, in any proceeding or action to which Tenant is a party, a
receiver is appointed with authority to take possession of the premises.

         An involuntary assignment shall constitute a default by Tenant and
Landlord shall have the right to elect to terminate this Lease, in which case
this Lease shall not be treated as an asset of Tenant.

38th. WAIVER OF JURY TRIAL AND COUNTERCLAIM: The parties hereto shall and they
hereby do waive trial by jury in any action, proceeding or counterclaim brought
by either of the parties hereto against the other on any matters whatsoever
arising out of or in any way connected with this Lease, the relationship of
Landlord and Tenant, Tenant's use or occupancy of the Lease premises, and/or any
claim of injury or damage. In the event Landlord commences any proceeding for
non-payment of rent, minimum rent or additional rent, Tenant will not interpose
any counterclaims of whatever nature or description in any such proceeding. This
shall not, however, be construed as a waiver of the Tenant's right to assert
such claims in any separate action or actions brought by the Tenant.

39th. LEGAL EXPENSES: In case suit shall be brought for recovery of possession
of the leased premises, for the recovery of rent or any other amount due under
the provisions of this Lease, or because of the breach of any other covenants
herein contained on the part of the Tenant to be kept or performed, and a breach
shall be established, Tenant shall pay to Landlord all expenses incurred
therefor, including a reasonable attorney's fee.

40th. INDEMNIFICATION OF LANDLORD: Tenant will indemnify the Landlord and save
it harmless from and against any and all claims, actions, damages, liabilities
and expenses in connection with loss of life, personal injury and/or damage to
property arising from or out of any occurrence in, upon or at the leased
premises or any part thereof, or occasioned wholly or in part by any act or
omission of Tenant, its agents, contractors, employees, servants, lessees or
concessionaires. In case Landlord shall , without fault on its part be made a
party to any litigation commenced by or against Tenant, then Tenant shall
protect and hold Landlord harmless and shall pay all costs, expenses and
reasonable attorney's fees incurred or paid by Landlord in connection with such
litigation.
   5
41st. LIENS: Tenant agrees not to suffer or permit during the demised term, any
mechanic's or other lien for work, labor and services and/or materials furnished
or otherwise to attach to and become a lien upon the premises as a result of any
work done by or on behalf of Tenant. If such lien shall so attach, Tenant shall
within 30 days after notice thereof, either pay or satisfy the same or procure
the discharge thereof of record in such manner as may be permitted or provided
by law. Should Tenant fail or refuse to discharge any such lien within the
period herein provided, then Landlord is hereby authorized to add the amount of
the said lien to any regular installment of rent thereafter becoming due as
additional rent.

42nd. ESTOPPEL CERTIFICATE: Within ten (10) days after request therefor by
Landlord, Tenant shall deliver in recordable form a certificate to Landlord or
to any proposed mortgagee or purchaser certifying that this Lease is in full
force and effect and that there are no defenses or offsets to any rent payments,
or stating those defaults or claims claimed by Tenant; such certificate to be
furnished without charge.

43rd. NOTICE: All notices, requests, demands or other communications desired or
required to be given under any of the provisions hereof shall be in writing and
shall be deemed to have been duly given on the date mailed if sent by certified
mail addressed to Tenant at 50 Marcus Blvd., Hauppauge, New York 11788, and to
the Landlord at 684 Broadway, Massapequa, New York 11758, or at such other or
additional address as the parties may furnish by such notice to the other.

44th. NO BROKER: Tenant represents and warrants to the Landlord that Tenant has
dealt with no real estate broker, real estate company or salesman as to give
rise to any claim for brokerage commission or similar compensation and the
Tenant does herewith hold harmless, save and indemnify the Landlord from any
claims of any real estate brokers, real estate companies or real estate
salesmen for brokerage commissions.

45th. UTILITIES: The Tenant agrees to pay for all utilities utilized by it in
connection with its occupancy for the demised premises including, but not by way
of limitation to, fuel, oil, electricity, gas (if any) and water. The Tenant
further agrees to have the aforementioned utilities placed in its name and to
make any requisite deposits therefor before occupying the demised premises. The
Tenant further agrees to pay for the aforesaid utilities within ten (10) days
after bills therefor have been received by it.

46th. CERTIFICATES AND PERMITS: During the entire term of this lease, the Tenant
shall be required to keep in full force and effect all necessary certificates
for the purposes for which the demised premises are rented, permits and other
approvals or consents required by any governmental authority having jurisdiction
over the business conducted by the Tenant as set forth in the purpose clause of
this Lease.

47th. INSURANCE:

         (a) Tenant, at its cost, shall maintain a policy of standard fire and
extended coverage insurance with vandalism and malicious mischief endorsements
to the extent of at least 80% of full replacement value, defined as follows:
$2,500,000.00. The insurance policy shall be issued in the names of Landlord,
Tenant and Landlord's lender, if any, now or in the future, as their interests
appear. The insurance policy shall provide that any proceeds shall be made
payable to Landlord or Landlord's lender as Landlord may designate. If
necessary, and at Landlord's request, the Tenant agrees to assign and deliver at
the commencement of this Lease, said insurance policy to the Landlord and the
said policy and renewal thereof shall be held by said Landlord. In the event the
Tenant does not pay the premiums as they fall due on said policy, Landlord shall
have the option of paying said premiums on behalf of Tenant, and adding the cost
thereof to the next month's rent due Landlord under the terms of this Lease as
additional rent and to collect same as "additional rent".

         (b) Tenant, at its cost, shall maintain plate glass insurance and
public liability and property damage insurance and products liability insurance
   6
with liability limits of not less than $500,000.00 per person per occurrence and
$1,500,000.00 per occurrence and property damage limits of not less than
$50,000.00, insuring against all liability of Tenant and its authorized
representatives arising out of and in connection with Tenant's use, occupancy
and possession of the premises. All public liability insurance and products
liability insurance and property damage insurance shall insure performance by
Tenant of the indemnity provisions of paragraph "40th" of this Rider. Both
parties shall be named as co-insureds and the policy shall contain
cross-liability endorsements and the original policy shall be delivered to
Landlord at the commencement of this Lease. In the event the Tenant does not pay
the premiums as they fall due on said policies, Landlord shall have the option
of paying said premiums on behalf of Tenant, and adding the cost thereof to the
next month's rent due Landlord under the terms of this Lease as additional rent
and to collect said as "additional rent".


48th. DESTRUCTION:

         (a) If, during the term of this Lease, the premises are totally or
partially destroyed from a risk covered by the insurance described in paragraph
"47th" of this Rider, rendering the premises totally or partially inaccessible
or unusable, or partially damaged but still usable, Tenant shall restore the
premises to substantially the same condition as they were in immediately before
destruction, whether or not the insurance proceeds are sufficient to cover the
actual cost of restoration. Such destruction shall not terminate this Lease.
However, if premises are not able to be used by Tenant for its business
operation, rent will abate until premises are restored.

         (b) If, during the term of this lease, the premises are destroyed in a
manner described in subparagraph "(a)" of this paragraph "48th", both Tenant and
Landlord shall make the loss adjustment with the insurance company insuring the
loss, and on receipt of the proceeds, same shall be paid to Landlord and
Landlord shall hold same in escrow as follows:

All sums deposited with the Landlord shall be paid in installments by the
Landlord to the contractor retained by Tenant as construction progresses for
payment of the cost of restoration. A 10% retention fund shall be established
that will be paid to the contractor on completion of restoration, payment of all
costs, expiration of all applicable lien periods and proof that the premises are
free of all mechanic's liens and lienable claims, and the furnishing of all
municipal certificates. If the Landlord in its reasonable discretion determines
that a particular installment requested by Tenant or Tenant's contractor is
improper, it shall have the right to appoint its own construction supervisor to
determine the validity of such installment and to make payments on certificates
approved by Landlord's construction supervisor, and the reasonable expenses of
Landlord's construction supervisor shall be paid out of the escrow funds and
charged to Tenant's account.

         Both parties agree to promptly execute all documents and perform all
acts reasonable required by either Landlord or any substitute insurance trustee
to perform its obligations under this paragraph.

49th. CONSENT OF PARTIES: Whenever consent or approval of either party is
required, that party shall not unreasonably withhold such consent or approval
except as same may be limited by paragraph "37th" of this Rider.

50th. ADDITIONAL RENT: The Tenant shall pay as additional rent any money
required to be paid pursuant to this Lease and all other sums of money or
charges required to be paid by Tenant under this Lease whether or not the same
be designated as "additional rent". If such amounts or charges are not paid at
the time provided in this Lease or if real estate taxes, increases, water
charges or assessments as well as insurance premiums are not paid within the
grace period allowed by the taxing authorities, water companies or insurance
companies, they shall, nevertheless, if not paid when due, be collectible as
additional rent with any installment of rent thereafter falling due hereunder,
but nothing herein contained shall be deemed to suspend or delay the payment of
any money, charge or amount at the time same becomes due and payable hereunder,
or limit any other remedy of the Landlord.

51st. AS IS: The Tenant does herewith acknowledge and declare that it is fully
familiar with the premises and environs and the buildings and improvements
   7
thereon, and accepts said premises and environs, the buildings and improvements
thereon in an "as is" condition, and Landlord makes no representation or
warranty as to the fitness, feasibility or use of the demised premises, and any
violations placed on the premises either prior to or after the date hereof,
shall be removed by Tenant; PROVIDED, HOWEVER, that at the commencement of the
within Lease, it shall be the Landlord's responsibility to place the electric
oil burner and air-conditioning systems in working order.

52nd. CONFLICT IN LANGUAGE: Should any conflict in language or interpretation
occur between the printed provisions of this Lease and the provisions contained
in the Rider of the Lease, the parties agree that the provisions contained in
the Rider of the Lease, the parties agree that the provisions in the Rider shall
prevail. All reference to paragraph numbers in the Rider shall refer to
paragraphs so numbered in the Rider and not to paragraphs in the printed portion
of this Lease unless so designated or unless the context of the Rider is
intended to designate the printed portion of the Lease.

53rd. AGREEMENTS BETWEEN PARTIES: This Lease contains all of the agreements and
understandings of the parties and cannot be amended or modified except by a
written agreement.

54th. SEVERABILITY: The unenforceability, invalidity or illegality of any
provision of this Lease shall not render the other provisions unenforceable,
invalid or illegal.

55th. SUCCESSORS: This Lease shall be binding on and inure to the benefit of the
parties and their successors, heirs and assigns.

56th. TAXES:

         (a) The Tenant shall, and will, during the term herein demised, pay and
discharge all such duties, taxes, charges for water, sewer taxes, assessments
and payments, extraordinary as well as ordinary, whether foreseen or unforeseen,
as shall during the term hereby demised by laid, levied, assessed or imposed
upon, or become due and payable, or liens upon the said demised premises, or any
part thereof, or any appurtenances thereto, the leasehold estate hereby created,
the sidewalks or streets in front of or adjoining the demised premises or any
vault or vaults thereunder, by virtue of any present or future law, order or
ordinance of the United States of America, or of the city, county or local
government, or of any department, office or bureau thereof, or any other
governmental authority. The duties, taxes, charges, assessments and payments
described in the foregoing paragraph are sometimes referred to herein
collectively as "Impositions ".

         (b) All impositions mentioned in this paragraph shall be paid by the
Tenant when the same shall become due and payable without interest or penalty to
the department, office or bureau charged with the collection thereof. But
nothing herein contained shall require the Tenant to pay any inheritance,
franchise, income, payroll, excise, privilege, rent, capital stock, estate or
profit tax, or any tax of similar nature, that is or may be imposed upon the
Landlord, unless such taxes shall be levied upon the rent herein reserved in the
place of taxes upon the property herein demised. All taxes, assessments and
water rents that are mentioned above to be paid by Tenant shall be prorated and
adjusted for the fiscal years in which the terms begins and ends.

         (c) In the case of assessments for local improvements or betterments
which are assessed or imposed during the term hereof and which may be payable in
installments, Tenant shall only be obligated to pay such installments as fall
due during the term hereof.

         (d) In any suit or proceedings of any kind or nature arising or growing
out of the failure of the Tenant to keep any covenant contained in this
paragraph, the certificate or receipt of the department, office or bureau
charged with collection of the imposition, showing that the tax, water rent,
assessment or other charge, affecting the demised premises is due and payable,
or has been paid, shall be prima facie evidence that such tax, water rent,
assessment or other charge was due and payable as a lien or charge against the
demised premises or that




                                      -4-
   8
it has been paid as such by the Landlord.

         (e) The Tenant shall have the right to contest or review by legal
proceedings or in such manner as Tenant, in its opinion shall be deemed
advisable (which proceedings or other steps taken by Tenant, if instituted,
shall be conducted diligently at its own expense and free of expense to the
Landlord) any and all impositions levied, assessed or imposed upon or against
the demised premises or the building or improvements thereon, or taxes in lieu
thereof, required to be paid by Tenant hereunder. No such context or review
shall be undertaken in a manner that exposes the premises or Landlord's interest
therein to jeopardy.

         (f) Tenant upon request of Landlord will promptly exhibit to Landlord
all paid bills for real estate taxes, water rates and assessments, which bills
after inspection by the Landlord shall be returned to the Tenant.

         (g) Notwithstanding the foregoing provisions of this paragraph, Tenant
agrees at the election of Landlord, to pay to Landlord the amount of the
impositions imposed upon the demised premises for each fiscal tax year, in equal
monthly installments on the first day of each month during such fiscal tax year.
Such payments shall in the first instance be based on the impositions for the
prior fiscal tax year, and when the impositions shall be ascertained for the
current tax year, appropriate adjudgments shall be made. No interest shall be
paid by Landlord or Tenant on the monthly payments by Tenant, but the same will
be kept by Landlord in a separate escrow account, the funds whereof shall be
employed by Landlord to pay the impositions for the current tax year as they
mature. It is further agreed that if an imposition is payable in full before the
expiration of the fiscal tax year, whether in installments or by lump sum
payment, the monthly payments by Tenant shall be in amounts such that there
shall be a fund in Landlord's hands sufficient to meet the payment of any
imposition or installment thereof as it falls due. Each monthly payment of
Tenant shall be in an equal amount during the period between impositions payment
dates; in any event, at least ten days in advance of the last date for payment
of any imposition, or installment thereof, before a penalty or interest accrues
thereon, Tenant will deposit with Landlord an amount sufficient to make up any
deficiency for that payment.


57th. TERM OF LEASE:

         Unless sooner terminated, this Lease shall terminate on the tenth
anniversary of the last day of the month preceding the month during which the
original term of this Lease commences. Upon request of either the Landlord or
Tenant, the other party shall execute a document in recordable form, setting
forth the exact commencement date of the term hereof.

58th. MORTGAGE: Reference is herein made to a certain mortgage now a lien on the
demised premises presently held by the Union Savings Bank, and to the proposed
mortgage contemplated to become a lien on the demised premises to be held by the
New York State Job Development Authority. In the event that the interest rates
as to either or both of said mortgages should increase during the term of the
within Lease, the Tenant shall pay to the Landlord, as additional rent
hereunder, such sums as shall equal the amount of such increase or increases ,
as same should occur throughout the term of this Lease. Said additional rent
shall be paid on a monthly basis commencing on the first of the month following
each written notification to the Tenant of an interest increase hereunder.

59th. SUBORDINATION: This Lease shall be subject and subordinate to any and all
mortgages which may now or hereafter affect the Landlord's interest in the real
property of which the demised premises form a part, and of all renewals,
modifications, consolidations, replacements and extensions thereof. This clause
shall be self-operative and no further instruments of subordination shall be
required. In confirmation of such subordination Tenant shall execute promptly
any certificate that Landlord may request. Tenant hereby constitutes and
appoints Landlord/Tenant's attorney-in-fact to execute any such certificate or
certificates for and on behalf of the Tenant.




                                      -5-
   9
60th. IMPROVEMENTS: it is understood and agreed that all improvements of
whatsoever nature, any and all additions to the building, together with any and
all fixtures attached to the demised premises shall immediately become the
property of the Landlord, and shall be surrendered at the end of the demised
term, in good condition, reasonable wear and tear excepted.


                                        MARCUS REALTY


                                        By: /s/ BARRY STEINBERG
                                           ---------------------------
                                                            Landlord


                                        MANCHESTER EQUIPMENT CO., INC.


                                        By: /s/ BARRY STEINBERG 
                                           ---------------------------
                                           BARRY STEINBERG - Tenant




                                      -6-
   10

















                                  STREET MAP
















   11
State of New York, County of           ss:

        On the      day of              19  , before me personally came
                        , to me known, who, being by me duly sworn, did depose
and say that he resides at                       ; that he is
of                              , the corporation described in and which
executed the within instrument; that he knows the seal of said corporation;
that the seal affixed to said instrument is such corporate seal; that it was so
affixed by order of the Board of Directors of said corporation, and that he
signed his name thereto by like order.


State of New York, County of           ss:}

        On the      day of              19  , before me personally came
                        , to me known, who, being by me duly sworn, did depose
and say that he resides at                       ; that he is
of                              , the corporation described in and which
executed the within instrument; that he knows the seal of said corporation;
that the seal affixed to said instrument is such corporate seal; that it was so
affixed by order of the Board of Directors of said corporation, and that he
signed his name thereto by like order.


State of New York, County of           ss:

        On the      day of              19  , before me personally came
to be known and known to me to be the individual described in and who executed
the foreoing instrument, and duly acknowledged that he executed the same.


State of New York, County of           ss:

        On the      day of              19  , before me personally came
                       , subscribing witness to the foregoing instrument, with
whom I am personally acquainted, who, being by me duly sworn, did depose and
say, that he resided, at the time of the execution of said instrument, and
still resides, in                                         that he is and then
was acquainted with                             , and knew                 to 
be                the individual described in and who executed the foregoing
instrument; and that he, said sbuscribing witness, was present and saw
                   execute the same; and that he, said witness, thereupon at the
same time subscribed his name as witness thereto.


BUILDING

PREMISES

                                Landlord

                  to

                                Tenant

                 LEASE



                                   GUARANTY

        In consideration of the letting of the premises within mentioned to
the Tenant within named, and of the sum of One Dollar, to the undersigned in
hand paid by the Landlord within named, the undersigned hereby guarantees to
the Landlord and to the heirs, successors and/or assigns of the Landlord, the
payment by the Tenant of the rent, within provided for, and the performance by
the Tenant of all of the provisions of the within lease. Notice of all defaults
is waived, and consent is hereby given to all extensions of time that any
Landlord may grant.

        Dated,                   19

                                                                          L.S.


STATE OF             COUNTY OF                       ss:

        On this      day of             19  , before me personnally appeared

to me known and known to me to be the individual described in and who executed
the foregoing instrument, and duly acknowledged to me that he executed the
same.
 










   12
        Modification of Lease dated January 17, 1996, between Barry Steinberg
d/b/a Marcus Realty, as Landlord, and Manchester Equipment Co., Inc., as
Tenant.

Re: Premises at 50 Marcus Boulevard, Mauppauge, New York 11788.
- --------------------------------------------------------------------------------
        The Landlord and Tenant hereby agree to modify the terms and conditions
of the Lease as follows:

                1.      Anything to the contrary notwithstanding commencing
October 1, 1996, the rents shall be adjusted and modified in accordance with
the following provisions:

                        Rider Paragraph 34 of the original Lease shall be
deleted and in place and stead thereof the following provisions shall apply:

        34.     The base rent for the described periods of the term of the
                within Lease shall be as follows:



                                                Period          Monthly
                                                ------          -------
                                                          
Feb. 1, 1996 to July 31, 1996                   $222,000.00     $37,000.00
Aug. 1, 1996 to Jan. 31, 1997                   $162,112.50     $27,018.75
Feb. 1, 1997 to Jan. 31, 1998                   $333,851.74     $27,829.31
Feb. 1, 1998 to Jan. 31, 1999                   $343,970.29     $28,864.19
Feb. 1, 1999 to Jan. 31, 2000                   $364,289.39     $29,524.11
Feb. 1, 2000 to Jan. 31, 2001                   $364,918.07     $30,429.83
Feb. 1, 2001 to Jan. 31, 2002                   $375,865.61     $31,322.13
Feb. 1, 2002 to Jan. 31, 2003                   $387,141.57     $32,261.79
Feb. 1, 2003 to Jan. 31, 2004                   $399,755.81     $33,229.64
Feb. 1, 2004 to Jan. 31, 2005                   $410,718.48     $34,222.53
Feb. 1, 2005 to Jan. 31, 2006                   $423,040.03     $35,283.33
Feb. 1, 2005 to Jan. 31, 2007                   $435,731.25     $36,310.83
Feb. 1, 2007 to Jan. 31, 2008                   $448,803.14     $37,400.28

            
   13

        2.  This Modification is conditioned and shall take effect only upon the
Tenant successfully completing the Public Offering of its shares now
contemplated. In the event the Public Offering of shares now contemplated is
not concluded, on or before January 1, 1997, then, unless said date is extended
by written agreement of the parties, this Modification shall be null and void,
and the Lease shall be enforceable as originally written.

        DATED:  OCT. 2, 1996



                                        /s/ BARRY STEINBERG
                                        ------------------------------------
                                        Barry Steinberg, d/b/a Marcus Realty,
                                        Landlord


                                        Manchester Equipment Co., Inc.


                                        by:  /s/ JOEL STEMPLE  V.P.
                                           ----------------------------------
                                                       Tenant